[clang][LoopVectorize] Inccorrect code generation in case of vectorize_predicate(enable)

[futog]

Configuration:
--target=armv7a-none-eabihf -march=v7-a -mthumb -mfloat-abi=hard -mfpu=neon -O3

In vectorize.c:
var_27 will be set to '1', which is not correct.

The reason is that in BasicBlock for.cond.for.cond.cleanup_crit_edge (pred is middle.block) the arr_14 array is overindexed.

I think that the problem is that tail-fold by masking happens, even though the loop induction variable is used outside of the loop.

vectorize.zip

[fhahn]

Looks the same as #51677